Stumbling Issues - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-14-2006, 12:13 AM   #1
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Default Stumbling Issues

Alright.
Jet Stage Two chip went in 1000 kms ago. I re Installed my 2.2 pulley 500 kms ago.
It took one day for the Jet stage Two to get rid of my second gear WOT stumble around 3800+ rpm, car moves good now around town.
On the highway now, it is doing what it was before..Stumbling at WOT in 3rd gear around 3800+ rpm, so bad I wouldn't hesitate to guess I am pulling 20 degrees of KR. Ext. Temps tonight are 14 F, and was stil doing it...temperature doesnt seem to matter. I am running a 195 thermo with my Jet Stage two due to extream cold temps outside at times..I need my heat as well..
Car also stumbles and without a doubt pulls KR climbing a hill in second gear WOT.
It does not like to labour. I cant figure out why the hell not.
I can not for the life of me find an exhaust leak or vacuum leak.
Air intake is wide open
new FPR.
Its acting like it still isnt getting quite enough fuel on the top end..
This is really dissapointing me hardcore
Car only does this with the 2.2 SC pulley, it pulls 0 KR across the board with the 2.55
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Old 03-14-2006, 12:33 AM   #2
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I would like to see some scan data on it.
O2, maf, ipw, ltft, stft, kr, rpm, gear.

Can you get a 2.3" pulley to try?
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Old 03-14-2006, 12:35 AM   #3
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Only Pullys avail to me are the 2.2 and 2.55...
02 Has always read rich at WOT, no problems.
IAT is usually within ten degrees F of outside temp..before my KR would jump all over the board at WOT, didnt usually stick to one figure...
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Old 03-14-2006, 12:37 AM   #4
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Check your EGR tube for me... just a hunch.
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Old 03-14-2006, 12:39 AM   #5
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Connected, and sealed, no leaks at all. one of the first things I checked, i though, hmm it might be cracked..nope...good to go.
Maybe to much pulley for my car?
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Old 03-14-2006, 12:42 AM   #6
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You know, I cut half a second off my quarter by running half a can of Seafoam through the intake...
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Old 03-14-2006, 12:44 AM   #7
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But my intake and all that were just off the car like 3000 kms ago...it was all soaked and what not..
Not so sure that would help at all on my car??
bleh
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Old 03-14-2006, 12:45 AM   #8
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Could be deposits in your combustion chambers. IMO, I feel Seafoam helps most with in-cylinder cleanliness than the intake.
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Old 03-14-2006, 12:49 AM   #9
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Maybe I will give it a shot.
I have a gut feeling it wont fix massive ammounts of KR however. To date the only fix for that is the stock SC pulley....
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Old 03-14-2006, 12:50 AM   #10
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What are you running for plugs and gap? maybe you need cooler plugs?
Are your mannies still getting hot? usually means the exhaust port is opening while the mixture is still burning.
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